Here is the full list of all 13 The Lords of the Earth Flame achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Open comic ending of the game.
Take the crown
Take the knife
Finish the game of death.
Select the alchemist
Take the ruby
Romance with Gerda
Help the wounded
Finish the game.
Finish the game without dying.
Starting a game for the first time.
Open glossary.
View a map of the World.